Physics (Stress & Strain)

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What is the factor of safety for a steel hanger having an ultimate strength of 70000N per cm^2 and supporting a load of 87500N. The hanger has a cross sectional area of 5cm^2.

Factor of safety =
ultimate stress/ allowable stress
= 70000/87500
= 0.8
Have I done this correctly?

  • Physics (Stress & Strain) -

    Stress = force / area

    Load is 87500N which is just a force.

    You need to divide the force by the area resisting the tensile stress.

    Factor of safety is then
    ultimate stress / stress under load

  • Physics (Stress & Strain) -

    Stress = force/ area
    = 87500N/ 5cm^2
    = 17500

    = 70000/ 17500
    ANS = 4

    Is that correct?

  • Physics (Stress & Strain) -

    Correct!

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